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Related Parties	3 Months Ended
Related Parties	Mar. 31, 2021
Related Party Transactions [Abstract]
Related Parties	Related Parties Investment Banking Revenue includes advisory fees earned from clients that have Senior Managing Directors and certain Senior Advisors and executives as a member of their Board of Directors of $5,612 for the three months ended March 31, 2021. Other Assets on the Unaudited Condensed Consolidated Statements of Financial Condition includes the long-term portion of loans receivable from certain employees of $8,693 and $10,159 as of March 31, 2021 and December 31, 2020, respectively. See Note 15 for further information.